[Exmeaning]

Summary

• Extend getBuildThemeBands (src/lib/masterdata/build-settings.ts) to include every playable character's mainColorCode grouped under their band in stage displayOrder (while filtering out non-playable NPC entries such as id: 1001 with placeholder #FFFFFF colors).
• Add a shared Material Design 3 AccentColorPicker (src/components/shared/AccentColorPicker.tsx) used by both SettingsDrawer and DesignSystemPage:
  • Compact top MD3 selection pill for the default MoeNotes seed (#4C9DF0).
  • One compact, high-density row per band ([Band emblem swatch | 5 Character face swatches]) with roving-tabindex radio navigation and shape-morphing MD3 swatches.
• Expand tests/settings-theme.test.ts to verify MD3 token generation and WCAG 4.5:1 contrast ratios across all 5 band colors and all 25 playable character colors, plus add tests/accent-color-picker.test.tsx.

Verification

• bun test (1,006 passed across 118 test files)
• bun run check
• bun run check:search-seo
• bun run lint